Pg. 148 (fig. 5), 149. Near Salem, Ohio, rocks are mostly of Allegheny age and best outcrops are in ravines along Middle Fork of Little Beaver Creek. Brookwood Hollow is one of these ravines and exposes beds from Clarion(?) to Lower Freeport sandstone. Most significant members are between Lower and Middle Kittanning coals. In this interval three limestones are exposed: marine Columbiana (formerly Hamden), consisting of thin nodular limestone associated with fossiliferous shale above the Lower Kittanning coal; nonmarine lenticular Hamden limestone interbedded with Oak Hill underclay; and nonmarine Leetonia (formerly Salem) in a ledge at base of Middle Kittanning underclay. Until recently only two limestones, Hamden and Salem, were recognized in this interval. Term "Hamden" had been applied to both the marine limestone and shale over the Lower Kittanning coal and to the nonmarine limestone and ironstone associated with Oak Hill underclay. Type Hamden is nonmarine, hence name Columbiana has been proposed for the marine member. Name Leetonia is proposed to replace name Salem in this interval. Type Salem is about 3 miles southeast of Salem. Its name was a poor selection and not intended for continued use. Occurs between Strasburg coal below and Middle Kittanning coal above. Stratigraphically above Hamden limestone. Thickness about 5 feet. Age is Pennsylvanian.
Type section (=Salem limestone of Stout and Lamborn, 1924, Ohio Geol. Survey Bull., no. 28): along abandoned Y & O RR at deserted mine of Salem Mining Company, in NW/4 sec. 3, Salem Twp., Columbiana Co. Named for town of Leetonia, Columbiana Co., eastern OH.

Source: US geologic names lexicon (USGS Bull. 1350, p. 421-422).

Leetonia Limestone was formerly designated Salem Limestone by Stout and Lamborn (1924) but term "Salem" was preoccupied. Sturgeon and others proposed in paper read before the Ohio Academy of Science that name "Leetonia" would be a more appropriate designation for this unit. Name was selected because Orton (1884, Ohio Geol. Survey, vol. 5) described a section with this limestone in it at Leetonia but did not name the limestone. Stout and Lamborn's type section for their Salem is only a few mi from Leetonia. Name "Leetonia" like name "Columbiana" has been given informal usage by interested geologists and is accepted here in accordance with a publication by Sturgeon and Delong (in press). Member described at its type locality as bluish gray, hard and dense, blocky in form, siliceous and ferruginous, and in places a calcareous sandstone and in other places an iron ore. In Sandy Twp of Stark Co. there occurs at this position a nodular zone that may represent this stratum.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Revision of stratigraphic names between Lower and Middle Kittanning coals. Hamden, Leetonia, Columbiana, and Tuscarawas (new). Leetonia replaces term Salem. Occurs above Red Kidney ironstone and below Middle Kittanning coal. Type section noted. May be correlative to Snow Fork ironstone.

Source: GNU records (USGS DDS-6; Reston GNULEX).

Leetonia limestone is unranked nonmarine limestone in Allegheny Group. Occurs in clay or shale unit below Middle Kittanning coal.

Source: GNU records (USGS DDS-6; Reston GNULEX).